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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1dfa4543d10494c158eac4edfdb22aa169d3ad21d56b8c7d77d181e6bb103a' 
  AND token = 'ra40z8bENOThXsHCsJf8Ynq0vjm6O6w6cIFyWqibI94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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