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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf13c9085dd4f330df32e8a012dbb2be23566da64e477a9d1c2efd702e8c5bd7' 
  AND token = '/1pEWeJCoazNmvgfOh0BhPsDvAja1oO3v/qdr+XsDYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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