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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06cfd943331541c93361c1d3bdf6a9794e9a26a3c935f4bc9b42e85086ea09a' 
  AND token = 'D6EaqXY+ZByA+19dzZFidAEJ8j0dfZRYZOAXgHIpUQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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