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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db385bc2b69d10320a64cbef60abc26aa3cf1667357155f2a58ae432cb207f6e' 
  AND token = 'rJVQELp/j9gY6ZKlfx1wpNLYl1n88tHbEVeAYV8U/wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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