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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14dee87b2216ab5be00adcdb52731a11e5db1d66c618cdb47c929d495ca685c' 
  AND token = 'oYqLRt8bwZZK2a29NV2//VviaU4Lmp8lgSKnGqCg9Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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