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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf2e7ad7d245ae9d5c963c409dd0897f2f37f7f9d1ff3c95abcc38cb32b14bd' 
  AND token = 'hZMGvnaQ37WveopB4f8sveD5pXDUjjTA/pxZ+se1skk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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