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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ae7eeb0e482bd58fe00da961d24181b1c5b92cbca3b8c471fa223a8765305b' 
  AND token = 'L5+3ksDqFaMcMwk6GoY94pXfNNAPzdd0WfciAEriVSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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