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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32102d86d38592ee743859fb0f53c4e8c56756a963d712ca8f3859932cd86c95' 
  AND token = 'k/rPY6/xm1bF9L1A47Pzxov7djkWRME4/3PpgyB92Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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