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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47060efbded9f63a47acbeb0e1bf1d89e90e9a0d0f0848df2c09e1eb1bc585a' 
  AND token = 'mWygoYD4+y6MjoMNG9XTScadxhAlh0Ee/JjafGzQT/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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