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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c55c16bf1eb02f4b4862f901202ed9a0de61e763f55727566580321dc20cea0' 
  AND token = '13dVAFPot47LtECk/7mu+IyapryBCzbz8sj3fyBPK30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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