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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e78fa0ca4961b176c20b141f53612db11b6b61f5c3f058ecf235c79780318bd' 
  AND token = 'U7w4493ejxXB32yPao3BrRmOwyU3rxYhlgt9Pvs1Cmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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