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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '420d18f0a59fdf9528e66eed191754f479f0a0726d2d5f32b7e5033f6411a6c9' 
  AND token = 'hYDszJssz55A29hk8e5qVWb/r5Rg5giZNJMNntqnWu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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