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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31aa2a47d0bd1499789eaf7e69007a9b7740bd3800a793c350ac0f82f6f16f92' 
  AND token = '40XkYviAU8Unm3MPHCKS0u5o86Ap8SbEU+Mha1eT2vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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