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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27760f152d11f0f4c08f36fdded839a91a8ed4eaf0b6c7e2ef2b11b52d85c266' 
  AND token = 'svjU33AjvGbErpkS4563C5Fy9LDWj6l73gmsrTCG4JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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