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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd88e12f62623f398d156a0794c224ea2114f2b9d868555196ec43a943fa6b7' 
  AND token = '2BSAoc6fz0tTYIlOAEPqs2dCX5PZly4BhJC+P4bENRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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