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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07746614adeda0a14439abd93553e9a8b290fbfd799069e00524805fba1fc2d1' 
  AND token = '7IMv6Du9+OaBZWHG2g+eUUBI0OGV7Ru6iUF8SCUUT4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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