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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '781192606e99b433019867c97e642d525f3aacfe9166c475910a174eca78a66b' 
  AND token = 'Kt9h+MtEqg78+RCSajrsak3tCc27eOKlJJGXE/sty3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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