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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3a1b5f621a8da39af057f3c699b5e043761cb94a937f0f74c2ad6a1ecf12ed' 
  AND token = 't9rMOy7nee0FtP8361N6X99P8Rqbv1pO3EVr0oe2zD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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