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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4c19266acac6ed2f576e8b147bb96102bec36bc9b70e6dd78a4fff769955af' 
  AND token = 'rvB7xsywXTL8IfZ9vn+Q9mrhw+wmMkE2YcOj8AnKSws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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