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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca201b565d80af132834b61e446233eb7b0ecd9f7a47b1f86130aee6772a933a' 
  AND token = '0MCw2J86VjpyFFiDElOKJD9pB6HDgWubfrulO+bU2A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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