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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a57f3e8dfb31b44233ca64b7b56237d36d9c06b25f65fcd366b57aabb476c0' 
  AND token = '9etSrAxF3dYlP5i6C917+3rX/Zz1bfy1L5dxSUmoVOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}