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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca67ffe4c16e2198f1f6e10b01e212e2ecdd22935ae1dc2e19f446cef75b095' 
  AND token = 'OR2L2uTWACXbGe+rsNBA2CAkQGbNiZY0kU2iuvTDPOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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