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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92dc50f4f77719815820ab8f710ea03e51c6ec0fb8edbeaa3606d317e11cc94' 
  AND token = 'js8Yj0eg3S1rCLw+eieEfQ34aVgXbQU8QgOCUxI/XoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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