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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de971517d97ac7394fdeae1368c8ed64922201e3dc1f4d4b7ee3e9e470f809bf' 
  AND token = 'IMncZGwBo6dNj9aBS1pHazY9UO2bRLjGXY1/G89b42c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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