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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c407101379bb7b67565121fad44a22dced75a50dc6be485f3138d89ee08d0f1c' 
  AND token = 'zFpmtNilS7wAJ8AGnthfRJwW5zdmgTer0KGtXigr4ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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