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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f094d3df57eace661f2fe4f3e7632f21e9c30fe7ffd3571357a0b33a1402fb' 
  AND token = 'gPc8IlWrYK7Bp7eWDOYqUJfyVP0Zyo9F9qOob4Eed4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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