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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e31024b9a903cbf144465b3d1108c8520a539e1ad954a88c9c105f67f5f8a0' 
  AND token = 'vuOe1Rd/iQ9W1u0a6T1gOcfahA90N0Oicy19oNtIvv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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