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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4e6edb14713f58849120bc927617dc2b96490c701e675c7fe0c664ec8619c0' 
  AND token = 'ljC7hX091C1xQGiCQG5rSEi3NCErhyigEGcZm1qjMGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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