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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6712bb85b8e2354605eda9a2a0270ebe54eb54ec9a90626ceeab2927964445e9' 
  AND token = 'LfjIIjSwI3Dw29xx8Rt4DK4eCq3+zZPVYdULU6p5Nrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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