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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f6fb566509fa67b0acec3e57402911d2efab1b121be3051723592c1643f8fa' 
  AND token = 'C+8l/gF2SOtTd6pOwYMOWcb181n5fhMJ/jpIywqJogQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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