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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec6022b6d08b86540344af1f7ea1ee7005f7df307d68ead96dfb5ef1a4be76e' 
  AND token = 'hkUCjScjAmoJMyI0rahA0S6poRgcj3Ld30Bp/cN5lNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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