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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63cb773fc8e63919e78b006b622fdc3a2f8b0b5abe54141e9ca55881079e20f' 
  AND token = '/rdTHtvfCH3ju9tbsEPfaI1L+i0z9pAWB2s7T3XdfzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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