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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e256ffb65d5f7cf64b6f8dc5c6935cb7f3b0f18e567ba2fa67c250c4f3a0c3' 
  AND token = 'VIZqup4a0lfpz3+04CmqFsz0uq8S1T8aq3SAFqe8OmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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