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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17cc0ab014e038192ead1143adc4721596ca0d6bf5d6498ba663606f6b61977c' 
  AND token = '+7a0uEOR/tIHYowh1owJWPR9QkDPrNx5iTOHRHTKDUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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