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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc00c0d7a482e0d6fa3703fc8e8c68fbe39d8f2f537cc5f28f5e06dda974221a' 
  AND token = '/VojQ0XlTqbCudG0TsUmeCBPGuzHIkCf2lAwA1f8EG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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