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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7731e53a0443252bf707e32caa876437d1ee3d7aacd35350ce1b3f0cdd31809' 
  AND token = 'zShbL7YUpR8FRJD8+W/7pdHgQqlcnBEhF674F9rh02s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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