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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '142d5b724e51c4653d0408591a59658945ba0c18cb71b401c2617f55507e5b67' 
  AND token = 'BHSkV6XB4gnVgZrsMUngMGqVmnWdn+BNnu8xtQu/H2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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