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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5bf0167f5d0cf5eef42ded812eb5f3b68783f72fd510dcac2933eab18b87d51' 
  AND token = 'WHBd/UXZmRrLk+yAp1whufkPw5yY/MTve4YOgdQCNb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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