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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cc62eccb304e80e67a9ceb30102119aa712ded68746da067b4f777a2879a1b' 
  AND token = 'YkPT3yVM++38vzTWSE1ayQBiCTjU+r89DQV9CGN+bzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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