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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '317471ded4a1f5ece9a04cc6b3bec3a441ee1ff28d2329c6f13dd51cb080daa7' 
  AND token = 'aNzdTMiAkPPDx0g01uy9MfF2RVW9zlK2CNuBT5nkqXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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