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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0aa5985a31db987b44ae1ebc9ef0f1ee12e56143a7edc66cde12985f41f62f8' 
  AND token = 'e1+ljORBFS73csfkSRq3DfHjx44f8cYI5t5N9padXwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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