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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f03d0fe50e9a11a5f346e79bcf93eb3afe5e8e5fac9163cb8d13f39394bba2' 
  AND token = 'sCqstowMPUWX8NNPmnBXYLEcO/X/8gPoSmuNWhjt4aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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