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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f09ca9495b0b58b33085489dd0ccb4ec326f773c86e1d8cc2b28d39e2774c8c' 
  AND token = '3msNJeOA2voP1YNXzgHhCDgeuz680ZseSnGu7maeFh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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