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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ef5ee7419a050e59c0f6ad3baef348d81bc1a90e51a571bd1e131e6c4c407d' 
  AND token = 'EyJWGcNl9yZ+BrverRHRAhjVKXzuGfdtAWVVJchcxFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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