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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '456816a8947b50f0a55614e66466d15c50f129796005b1df182d9d2a1eddde83' 
  AND token = 'rxqTotq80INu2NKplxpe9VTzvNDU/9jZQcR2Iu34bBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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