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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a33e612a82a59122243c8817430266a0bf731d2fb02bae52ba09a57f52223c0' 
  AND token = 'kj91Sbp+HA0111j8QNnnseJgR5ovgBQ7byvCM8+oBjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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