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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e464e78f4959a6a788f5580e756440cb5cc8957743f131b3849c9ce7f5cc5c' 
  AND token = 'J81lPUJLyMENjAMGBqSBfF+4AtM0snmz2k9JD0ERAIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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