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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8430fd4073504f2ccbef20e9c88888a42373b2ec6b51dba6d5914cbb6b479391' 
  AND token = '9bLbHnYX+vA4wT3p3ASXORlhGxOs47GhD+CoYksj5gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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