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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd2dccd0879de40e43eabf5b3a620216e3759fe6ea2ac6e31ee0d0baebf7b39' 
  AND token = '0jvfxM01xJm8+Rp/N5PdJgbG6zekXJWjmgajjR+bna4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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