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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '123c78ccadaa2d44d3014224a1c732cb5aad61a673df4d276a5542d1cd2b82fb' 
  AND token = 'MRGzKlz96fIPRUQ082dJD3+Xso37TSMv/KlNbKHzVGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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