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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29844112ce730a383a1f865864db348211491bd1fcfa41e225a3d123508339db' 
  AND token = 'pOrfe6i82/LMBW+Ea5max+s41e5Fg0LID2/HgxRdxHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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