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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80011e18a545e8faa354b1e7d2c0ca2c3bf0f105057fce5b3c91e6bb89b9e23b' 
  AND token = 'krK8u23Qd0bQx7frQuvZ3ZAPNMkVCYMXPc7pMqmpERc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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