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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7252c7c76bd268bf83fff1393a962bc354d71878e9239de79f39826a8c67cc1a' 
  AND token = 'X+uWcm07Noj8RB8dNqIXlIB2XMkKLn9s9vo98jhFYg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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