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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a515944bb5035c4ad500f8968deaebb8e79f29aaac988619794de0b75b084b4' 
  AND token = 'JepJed0dW05q7+XViWAeT84pWox4uxcj8R42XV+Zph0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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