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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9723b521b0d33eabe536a24af2ba1e7847f0f3518d9b865771023f81b8384a53' 
  AND token = '/UbmLogyTaURfxG5t5/LIr8y7Z/Rw/AeieY15I1gmFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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