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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8eb72983742be1f0f1cd0316c984c931a2a7162ce76cf3985fa25b5b1679fe' 
  AND token = 'lasOKQmi+AoCgKOePfyHBvMei/b8F2rfyZO+MejRUDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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