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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29d13eb8a0e4ae22e8783e0d5b9f1d1854fa0b130215841dcc6e5f48066a865d' 
  AND token = 'xNhgKgKqOVjIOCX7Jaa7xSs+ILfz9J0pVtOZ5g226bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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