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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7971c11bcfd37a93dfe023865eeca35ce1002de4f6e4ff226b076b69ad736347' 
  AND token = 'z9LDFYmCuVcJh465chzzl03MRFAmHkFPcOf563HJE+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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