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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85827c0752ac95f120f614c0178a9286ddafaf040b0028bf0b9cd897dec8d3f2' 
  AND token = 'g6bA0pmp7q0CfY+HPihxCuBJggGF7G4X3nbD4wDuQXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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